The benchmark 10-year note yield fell to 3.05 percent while the 30-year yield slipped to 3.306 percent. Bond prices move inversely to yields.
The Dow Jones Industrial Average and S&P 500 fell on Friday, adding to their steep losses for the week. Both stock indexes were down 4.3 percent and 3.7 percent, respectively.
Investors also bid up traditional safe havens as oil prices plunged. U.S. crude fell more than 6.5 percent to $50.91 per barrel, reaching its lowest level of 2018. Declining crude prices can signal the global economy is slowing, which would lead investors to cut positions in riskier assets in favor of safer ones.
Crude's decline comes at a time when U.S.-China trade tensions have raised concern of a possible economic slowdown. The two countries have imposed tariffs on billions of dollars worth of each other's goods as the Trump administration takes on a protectionist stance on trade.
U.S. and Chinese leaders are expected to meet at a G-20 meeting in Argentina at the end of the month, though few economists expect the scheduled talks to resolve the trade dispute.